Ganglia are made up of a cluster of

• A. Glial cells
• B. Neurons
• C. Muscle fibers
• D. Blood vessels

Answer: (B)

Ganglia are nerve structures in the peripheral nervous system that primarily consist of neuron cell bodies packed together. This clustering of neuronal bodies is what defines a ganglion. Glial cells surround and support these neurons, but the main components are the neuron cell bodies themselves. Muscle fibers and blood vessels are not the defining parts of a ganglion. For example, dorsal root ganglia contain the cell bodies of sensory neurons, while autonomic ganglia house postganglionic neurons. Hence, the best answer is neurons.